Liquid Discharge Head Rib Protrusion for Joining Strength
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Solution Overview
Problem
The existing liquid discharge head design faces joining failure between the first and second channel units due to insufficient pressing force, as the rib does not protrude beyond the tube, leading to a shortage of pressing force during the joining process.
Innovation Solution
The design includes a first channel unit with a tube and an outside portion on the opposite surface, where the ends of both extend to the same position, and a coupling portion that couples the outside portion with the tube, allowing the tube's circumferential portion to be exposed and extend in the orthogonal direction, enabling effective pressing force application during joining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the rib is designed to couple the tube with the raised portion without protruding beyond them, then the structure is compact and simple, but the pressing force is insufficient causing joining failure
Solution Approach 1:
The invention extends the rib in the orthogonal direction (perpendicular to the joining surface) to protrude beyond the tube and raised portion. This dimensional extension allows the rib to receive and transmit pressing force effectively during the joining process, resolving the contradiction between compact structure and sufficient pressing force by utilizing the third dimension (height/protrusion direction) to achieve both goals.
2Reliability
If the rib does not protrude beyond the tube and joining surface, then the design is simpler, but the pressing force is insufficient leading to joining failure
Solution Approach 1:
The rib is extended in the orthogonal direction to create a protruding structure that goes beyond the tube and raised portion. This dimensional change enables the rib to effectively receive and transmit pressing force during joining, ensuring reliable joining while maintaining relatively simple structure by using a single extended rib element rather than multiple components.
Data Source
AI summary
There is provided a liquid discharge head including a first channel unit and a second channel unit. The first channel unit includes: a first joining surface; a tube disposed on an opposite surface opposite to the first joining surface; an outside portion; and a coupling portion. The second channel unit is joined to the first joining surface. An end of the outside portion and an end of the coupling portion in an orthogonal direction orthogonal to the first joining surface extend to an identical position in the orthogonal direction. The tube includes a circumferential portion that is exposed outside and extends in the orthogonal direction to the identical position to which the end of the outside portion and the end of the coupling portion extend.